Gage, N. L. (1978). The scientific basis of the art of teaching. Teachers College Press, Teachers College, Columbia University.
Lua i Stíl Chicago (17ú heag.)Gage, N. L. The Scientific Basis of the Art of Teaching. New York: Teachers College Press, Teachers College, Columbia University, 1978.
Lua MLA (8ú heag.)Gage, N. L. The Scientific Basis of the Art of Teaching. Teachers College Press, Teachers College, Columbia University, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.